hgroup element mapping update (#398)

index.html

@@ -1232,13 +1232,17 @@ <h3>HTML Element Role Mappings</h3>
               <th>
                 <a data-cite="HTML">`hgroup`</a>
               </th>
-              <td class="aria"><a class="core-mapping" href="#role-map-generic">`generic`</a> role </td>
+              <td class="aria"><a class="core-mapping" href="#role-map-group">`group`</a> role </td>
               <td class="ia2"><div class="general">Use WAI-ARIA mapping</div></td>
               <td class="uia"><div class="general">Use WAI-ARIA mapping</div></td>
               <td class="atk"><div class="general">Use WAI-ARIA mapping</div></td>
               <td class="ax"><div class="general">Use WAI-ARIA mapping</div></td>
               <!-- <td class="naming"></td> -->
-              <td class="comments"></td>
+              <td class="comments">
+                If an `hgroup` contains multiple heading elements, then the heading element with the highest priority level 
+                MAY be treated as the sole heading of the `hgroup`. All other heading elements MAY instead be exposed as if they
+                were <a href="#el-p">`p`</a> elements. See <a class="core-mapping" href="#role-map-paragraph">`paragraph` role on Core AAM</a>.
+              </td>
             </tr>
             <tr tabindex="-1" id="el-hr">
               <th>
@@ -6140,6 +6144,7 @@ <h3>Change Log</h3>
       <section>
         <h4>Substantive changes since moving to the <a href="https://www.w3.org/WAI/ARIA/">Accessible Rich Internet Applications Working Group</a> (03-Nov-2019)</h4>
         <ul>
+          <li>08-Mar-2023: Update `hgroup` element to be mapped to `role=group`. See  <a href="https://github.com/w3c/html-aam/pull/398">GitHub PR 398</a>.</li>
           <li>08-Mar-2023: Clarify naming algorithm for `output` element. See <a href="https://github.com/w3c/html-aam/pull/402">GitHub PR 402</a>.</li>
           <li>12-Dec-2022: Revise mapping for `s` element to be `role=deletion`. See <a href="https://github.com/w3c/html-aam/pull/442">GitHub PR 442</a>.</li>
           <li>28-Nov-2022: Simplify accessible description computation section. See <a href="https://github.com/w3c/html-aam/pull/444">GitHub PR 444</a>.</li>